单项选择题

The most successful treatment described in the passage was a serum prepared from ______.

A．the blood of patients who have been stung
B．poison extracted from bees
C．crushed bodies of bees
D．a placebo and a crushed-body extract
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单项选择题
According to the researchers, the traditional treatment for bee stings is ______.
A．widespread
B．extremely harmful
C．almost futile
D．sensitizing
单项选择题
Results of the experiment indicated that ______.
A．patients treated with venom were stung less frequently
B．immunotherapy was effective for all patients
C．immunization took place in 7 out of 12 patients
D．the traditional treatment was as effective as the placebo
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